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Chemical Weapon

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https://www.readbyqxmd.com/read/29433753/a-glutathione-responsive-sulfur-dioxide-polymer-prodrug-as-a-nanocarrier-for-combating-drug-resistance-in-cancer-chemotherapy
#1
Wei Shen, Wanguo Liu, Huailin Yang, Peng Zhang, Chunsheng Xiao, Xuesi Chen
Multidrug resistance (MDR) in cancer remains a significant challenge for curing cancer by chemotherapy. In this work, a kind of glutathione (GSH)-responsive polymer prodrug of SO2 was designed and synthesized, which presented synergistic effect with doxorubicin (DOX) for combating MCF-7 ADR human breast cancer cell. Firstly, a small molecular prodrug of SO2, N-(3-azidopropyl)-2,4-dinitrobenzenesulfonamide (AP-DNs), was chemically conjugated onto the side chain of methoxy poly (ethylene glycol)-block-poly (γ-propargyl-l-glutamate) (mPEG-PPLG) block copolymer to generate an amphiphilic polymer prodrug of SO2, mPEG-PLG (DNs)...
February 3, 2018: Biomaterials
https://www.readbyqxmd.com/read/29426144/influence-of-environmental-changes-on-the-biogeochemistry-of-arsenic-in-a-soil-polluted-by-the-destruction-of-chemical-weapons-a-mesocosm-study
#2
Hugues Thouin, Fabienne Battaglia-Brunet, Marie-Paule Norini, Lydie Le Forestier, Mickael Charron, Sébastien Dupraz, Pascale Gautret
Thermal destruction of chemical munitions from World War I led to the formation of a heavily contaminated residue that contains an unexpected mineral association in which a microbial As transformation has been observed. A mesocosm study was conducted to assess the impact of water saturation episodes and input of bioavailable organic matter (OM) on pollutant behavior in relation to biogeochemical parameters. Over a period of about eight (8) months, the contaminated soil was subjected to cycles of dry and wet periods corresponding to water table level variations...
January 29, 2018: Science of the Total Environment
https://www.readbyqxmd.com/read/29409903/cholinesterases-and-the-fine-line-between-poison-and-remedy
#3
REVIEW
Carey N Pope, Stephen Brimijoin
Acetylcholinesterase (AChE, EC 3.1.1.7) and butyrylcholinesterase (BChE, EC 3.1.1.8) are related enzymes found across the animal kingdom. The critical role of acetylcholinesterase in neurotransmission has been known for almost a century, but a physiological role for butyrylcholinesterase is just now emerging. The cholinesterases have been deliberately targeted for both therapy and toxicity, with cholinesterase inhibitors being used in the clinic for a variety of disorders and conversely for their toxic potential as pesticides and chemical weapons...
January 30, 2018: Biochemical Pharmacology
https://www.readbyqxmd.com/read/29409565/the-management-of-the-khan-al-assal-chemical-attack-in-aleppo-university-hospital-auh
#4
M Ihsan Kaadan, Hilarie Cranmer
On March 19, 2013, Khan al-Assal was attacked with chemical weapons. In total, 20 people were killed and an additional 124 were injured; 63 people were cared for at Aleppo University Hospital on that day, where 14 died, all of them were civilians; 7 men, 6 women, and 1 child. This is a brief first hand report, for what has now become a more frequent, more deadly and horrific event in the lives of many Syrians. (Disaster Med Public Health Preparedness. 2018;page 1 of 3).
February 7, 2018: Disaster Medicine and Public Health Preparedness
https://www.readbyqxmd.com/read/29367863/fatal-sarin-poisoning-in-syria-2013-forensic-verification-within-an-international-laboratory-network
#5
Harald John, Marcel J van der Schans, Marianne Koller, Helma E T Spruit, Franz Worek, Horst Thiermann, Daan Noort
During the United Nations fact-finding mission to investigate the alleged use of chemical warfare agents in the Syrian Arab Republic in 2013, numerous tissues from a deceased female victim, who had displayed symptoms of cholinergic crisis, were collected. The Organisation for the Prohibition of Chemical Weapons (OPCW) authorized two specialized laboratories in the Netherlands and Germany for forensic analysis of these samples. Diverse modern mass spectrometry (MS)-based procedures in combination with either liquid chromatography (LC) or gas chromatography (GC) separation were applied...
2018: Forensic Toxicology
https://www.readbyqxmd.com/read/29361668/cutaneous-exposure-to-lewisite-causes-acute-kidney-injury-by-invoking-dna-damage-and-autophagic-response
#6
Ritesh Srivastava, Amie M Traylor, Changzhao Li, Wenguang Feng, Lingling Guo, Veena B Antony, Trenton R Schoeb, Anupam Agarwal, Mohammad Athar
Lewisite (2-chlorovinyldichloroarsine) is an organic and arsenical chemical warfare agent which was developed and weaponized during World Wars I/II. Stockpiles of lewisite still exist in many parts of the world and pose potential environmental and human health threat. Exposure to lewisite and similar chemicals causes intense cutaneous inflammatory response. However, morbidity and mortality in the exposed population is not only due to cutaneous damage but is also a result of systemic injury. Here, we provide data delineating the pathogenesis of acute kidney injury (AKI) following cutaneous exposure to lewisite and its analogue phenylarsine oxide (PAO) in a murine model...
January 17, 2018: American Journal of Physiology. Renal Physiology
https://www.readbyqxmd.com/read/29359226/chemical-language-and-warfare-of-bacterial-natural-products-in-bacteria-nematode-insect-interactions
#7
REVIEW
Yi-Ming Shi, Helge B Bode
Covering: up to November 2017Organismic interaction is one of the fundamental principles for survival in any ecosystem. Today, numerous examples show the interaction between microorganisms like bacteria and higher eukaryotes that can be anything between mutualistic to parasitic/pathogenic symbioses. There is also increasing evidence that microorganisms are used by higher eukaryotes not only for the supply of essential factors like vitamins but also as biological weapons to protect themselves or to kill other organisms...
January 23, 2018: Natural Product Reports
https://www.readbyqxmd.com/read/29283961/injuries-associated-with-police-use-of-force
#8
William P Bozeman, Jason P Stopyra, David A Klinger, Brian P Martin, Derrel D Graham, James C Johnson, Katherine Mahoney-Tesoriero, Sydney J Vail
BACKGROUND: Use of Force [UOF] by police can result in serious injuries and fatalities. The risk of significant injuries associated with different force modalities is poorly defined. We sought to determine the incidence of police UOF and compare the likelihood of significant injury with different force modalities. METHODS: A prospective multicenter observational study of all UOF incidents was conducted via mandatory UOF investigations at three mid-sized police agencies over a two year period...
December 28, 2017: Journal of Trauma and Acute Care Surgery
https://www.readbyqxmd.com/read/29209145/altered-neuroendocrine-immune-responses-a-two-sword-weapon-against-traumatic-inflammation
#9
REVIEW
Ce Yang, Jie Gao, Juan Du, Xuetao Yang, Jianxin Jiang
During the occurrence and development of injury (trauma, hemorrhagic shock, ischemia and hypoxia), the neuroendocrine and immune system act as a prominent navigation leader and possess an inter-system crosstalk between the reciprocal information dissemination. The fundamental reason that neuroendocrinology and immunology could mix each other and permeate toward the field of traumatology is owing to their same biological languages or chemical information molecules (hormones, neurotransmitters, neuropeptides, cytokines and their corresponding receptors) shared by the neuroendocrine and immune systems...
2017: International Journal of Biological Sciences
https://www.readbyqxmd.com/read/29197625/chemical-warfare-agents-classes-and-targets
#10
Michael Schwenk
Synthetic toxic chemicals (toxicants) and biological poisons (toxins) have been developed as chemical warfare agents in the last century. At the time of their initial consideration as chemical weapon, only restricted knowledge existed about their mechanisms of action. There exist two different types of acute toxic action: nonspecific cytotoxic mechanisms with multiple chemo-biological interactions versus specific mechanisms that tend to have just a single or a few target biomolecules. TRPV1- and TRPA-receptors are often involved as chemosensors that induce neurogenic inflammation...
November 29, 2017: Toxicology Letters
https://www.readbyqxmd.com/read/29183814/sulfur-mustard-resistant-keratinocytes-obtained-elevated-glutathione-levels-and-other-changes-in-the-antioxidative-defense-mechanism
#11
Simone Rothmiller, Sarah Schröder, Romano Strobelt, Markus Wolf, Jin Wang, Xiqian Jiang, Franz Worek, Dirk Steinritz, Horst Thiermann, Annette Schmidt
BACKGROUND: Sulfur mustard (SM) is a potent blistering chemical warfare agent, which was first used in 1917. Despite the Chemical Weapons Convention, a use was recently reported in Syria in 2015. This emphasizes the importance to develop countermeasures against chemical warfare agents. Despite intensive research, there is still no antidote or prophylaxis available against SM. METHODS: The newly developed SM-resistant keratinocyte cell line HaCaT/SM was used to identify new target structures for drug development, particularly the adaptations in protective measures against oxidative stress...
November 25, 2017: Toxicology Letters
https://www.readbyqxmd.com/read/29177587/intranasal-therapy-to-stop-status-epilepticus-in-prehospital-settings
#12
REVIEW
John Benfield, Alberto Musto
Status epilepticus (SE) is a medical emergency characterized by uncontrolled, prolonged seizures with rapid and widespread neuronal damage. Patients that suffer from longer episodes of SE are more likely to have poorer clinical outcomes and a higher cost of healthcare. Understanding novel molecular mechanisms that regulate inhibitory and excitatory neurotransmission that initiate SE and the necessary medical infrastructure to stop SE could help identify targets for early intervention. Intranasal administration of benzodiazepines may shorten the time between initiation and cessation of seizures when compared to other routes of administration...
November 25, 2017: Drugs in R&D
https://www.readbyqxmd.com/read/29141200/phosgene-oxime-injury-and-associated-mechanisms-compared-to-vesicating-agents-sulfur-mustard-and-lewisite
#13
Dinesh Giri Goswami, Rajesh Agarwal, Neera Tewari-Singh
Phosgene Oxime (CX, Cl2CNOH), a halogenated oxime, is a potent chemical weapon that causes immediate acute injury and systemic effects. CX, grouped together with vesicating agents, is an urticant or nettle agent with highly volatile, reactive, corrosive, and irritating vapor, and has considerably different chemical properties and toxicity compared to other vesicants. CX is absorbed quickly through clothing with faster cutaneous penetration compared to other vesicating agents causing instantaneous and severe damage...
November 12, 2017: Toxicology Letters
https://www.readbyqxmd.com/read/29120115/quantitative-determination-of-acidic-hydrolysis-products-of-chemical-weapons-convention-related-chemicals-from-aqueous-and-soil-samples-using-ion-pair-solid-phase-extraction-and-in-situ-butylation
#14
Suresh Pal Anagoni, Asma Kauser, Gopal Maity, Vijayasarathi V R Upadhyayula
Chemical warfare agents such as organophospshorus nerve agents, mustard agents, and psychotomimetic agent like 3-quinuclidinylbenzilate degrade in the environment and form acidic degradation products the analysis of which is difficult under normal analytical conditions. In the present work a simultaneous extraction and derivatization method in which the analytes are butylated followed by gas chromatography and mass spectrometric identification of the analytes from aqueous and soil samples was carried out. The extraction was carried out using ion-pair solid-phase extraction with tetrabutylammonium hydroxide followed by gas chromatography with mass spectrometry in the electron ionization mode...
November 9, 2017: Journal of Separation Science
https://www.readbyqxmd.com/read/29069930/long-term-health-effects-of-chemical-warfare-agents-on-children-following-a-single-heavy-exposure
#15
J M Talabani, A I Ali, A M Kadir, R Rashid, F Samin, D Greenwood, Awm Hay
In the 1980s, villages in the Kurdistan region of Iraq were exposed to chemical weapons (CWs), which killed and injured thousands of civilians. There has been no clinical assessment of the long-term effects of CWs exposure on those injured. We report the first such evaluation of CW effects on long-term health of children. Patients from the CW-exposed areas were interviewed to assess previous and current clinical history and underwent clinical examination. The status of organs known to be targets of CWs, including skin, eyes, respiratory and neuromuscular systems, was assessed...
January 1, 2017: Human & Experimental Toxicology
https://www.readbyqxmd.com/read/29052530/health-impacts-of-chemical-irritants-used-for-crowd-control-a-systematic-review-of-the-injuries-and-deaths-caused-by-tear-gas-and-pepper-spray
#16
Rohini J Haar, Vincent Iacopino, Nikhil Ranadive, Sheri D Weiser, Madhavi Dandu
BACKGROUND: Chemical irritants used in crowd control, such as tear gases and pepper sprays, are generally considered to be safe and to cause only transient pain and lacrimation. However, there are numerous reports that use and misuse of these chemicals may cause serious injuries. We aimed to review documented injuries from chemical irritants to better understand the morbidity and mortality associated with these weapons. METHODS: We conducted a systematic review using PRISMA guidelines to identify injuries, permanent disabilities, and deaths from chemical irritants worldwide between January 1, 1990 and March 15, 2015...
October 19, 2017: BMC Public Health
https://www.readbyqxmd.com/read/29018892/novel-treatment-opportunities-for-sulfur-mustard-related-cancers-genetic-and-epigenetic-perspectives
#17
REVIEW
Soheila Rahmani, Mohammad Abdollahi
Sulfur mustard (SM), also known as mustard gas, is a chemical weapon which by now has been used in many wars. The most concerning SM toxic effect is probable carcinogenicity. In this study, the genetic and epigenetic mechanisms of SM carcinogenicity, by focusing on treatment of SM-associated malignancies, particularly gene therapeutics, cancer vaccines, and epigenetic medications, have been criticized. The required data were collected through an organized search on valid scientific databases. For SM carcinogenicity due to acute or chronic exposure, the entire original and review articles were evaluated...
October 10, 2017: Archives of Toxicology
https://www.readbyqxmd.com/read/28973427/histopathological-and-molecular-changes-in-the-rabbit-cornea-from-arsenical-vesicant-lewisite-exposure
#18
Neera Tewari-Singh, Dinesh G Goswami, Rama Kant, David A Ammar, Dileep Kumar, Robert W Enzenauer, Robert P Casillas, Claire R Croutch, J Mark Petrash, Rajesh Agarwal
Lewisite (LEW), a potent arsenical vesicating chemical warfare agent, poses a continuous risk of accidental exposure in addition to its feared use as a terrorist weapon. Ocular tissue is exquisitely sensitive to LEW and exposure can cause devastating corneal lesions. However, detailed pathogenesis of corneal injury and related mechanisms from LEW exposure that could help identify targeted therapies are not available. Using an established consistent and efficient exposure system, we evaluated the pathophysiology of the corneal injury in New-Zealand white rabbits following LEW vapor exposure (at 0...
September 18, 2017: Toxicological Sciences: An Official Journal of the Society of Toxicology
https://www.readbyqxmd.com/read/28955764/the-delayed-effect-of-mustard-gas-on-housekeeping-gene-expression-in-lung-biopsy-of-chemical-injuries
#19
Marzieh Eghtedardoost, Zuhair Mohammad Hassan, Nayereh Askari, Alireza Sadeghipour, Mohammad Mahdi Naghizadeh, Sara Ghafarpour, Tooba Ghazanfari
OBJECTIVE: Sulfur mustard (SM) was used as a chemical weapon in Iraq-Iran war. Exposed people have major complications in important organs such as pulmonary system. Some studies have shown that SM could affect the expression of endogenous genes and non-housekeeping genes, time dependently. To understand the accurate molecular mechanism of the delayed effect of SM, the identification of the gene expression pattern in these patients is essential. Hence, we have evaluated mRNA expression of four common housekeeping genes (ACTIN, PGK1, β2m, GAPDH) in SM-exposed and non-exposed (control) formalin-fixed, paraffin-embedded (FFPE) human lung tissues...
September 2017: Biochemistry and Biophysics Reports
https://www.readbyqxmd.com/read/28927535/potentiation-of-hydrogen-peroxide-toxicity-from-catalase-inhibition-to-stable-dna-iron-complexes
#20
REVIEW
Tulip Mahaseth, Andrei Kuzminov
Hydrogen peroxide (H2O2) is unique among general toxins, because it is stable in abiotic environments at ambient temperature and neutral pH, yet rapidly kills any type of cells by producing highly-reactive hydroxyl radicals. This life-specific reactivity follows the distribution of soluble iron, Fe(II) (which combines with H2O2 to form the famous Fenton's reagent),Fe(II) is concentrated inside cells, but is virtually absent outside them. Because of the immediate danger of H2O2, all cells have powerful H2O2 scavengers, the equally famous catalases, which enable cells to survive thousand-fold higher concentrations of H2O2 and, in combination with adequate movement of H2O2 across membranes, make the killing H2O2 concentrations virtually impractical to generate in vivo...
July 2017: Mutation Research
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